| 1101 | Dalen Resources Oil & Gas Co. | Dallas, TX 75206 | Oil & Gas Operator | Jun 2010 |
| 1102 | Dallas Production, Inc. | Dallas, TX 75206 | Oil & Gas Operator | Mar 2021 |
| 1103 | Damar Resc Incor | | Oil Operator | Oct 1995 |
| 1104 | Damar Resources, Inc. | Hays, KS 67601 | Oil & Gas Operator | Apr 2025 |
| 1105 | Damson Oil Corpo | | Oil & Gas Operator | May 1994 |
| 1106 | Dane G. Hansen Trust | | Oil Operator | Dec 1994 |
| 1107 | Daniels E L Dril | | Oil Operator | Nov 1995 |
| 1108 | Daniels Oil Co. | | Oil Operator | Mar 2025 |
| 1109 | Daniels Petroleu | | Oil Operator | Jan 1991 |
| 1110 | Darco Petroleum, Inc. | Bartlesville, OK 74005 | Oil & Gas Operator | Dec 2020 |
| 1111 | Dark Horse | | Oil Operator | Jun 2025 |
| 1112 | Darnall, Walter E. | Chautauqua, KS 67334 | Oil Operator | Dec 2009 |
| 1113 | Darrah John J Jr | | Oil & Gas Operator | Oct 1994 |
| 1114 | Darrah John Jay Jr | Wichita, KS 67201 | Oil & Gas Operator | Aug 2025 |
| 1115 | Darrah Oil Company LLC | Wichita, KS 67201 | Oil & Gas Operator | Oct 2025 |
| 1116 | Dart Cherokee Basin Operating Co., LLC | Mason, MI 48854 | Oil & Gas Operator | Jun 2025 |
| 1117 | David D. Davis | Benton, KS 67017 | Oil Operator | Dec 2009 |
| 1118 | Davies & Company | Tulsa, OK 74114 | Oil & Gas Operator | Nov 2000 |
| 1119 | Davis & Fitzgera | | Gas Operator | Dec 1983 |
| 1120 | Davis Brothers O | | Oil Operator | Dec 1987 |
| 1121 | Davis Contract Pumping | | Oil Operator | Oct 2000 |
| 1122 | Davis Drilling & | | Oil Operator | Jul 1989 |
| 1123 | Davis Oil Compan | | Oil Operator | Jul 1988 |
| 1124 | Davis Operating Company | Elysian Field, TX 75642 | Oil & Gas Operator | Oct 2025 |
| 1125 | Davis Petroleum | | Oil & Gas Operator | Dec 1996 |
| 1126 | Davis Petroleum, Inc. | Great Bend, KS 67530 | Oil Operator | Aug 2021 |
| 1127 | Davis, Billy F. | Tulsa, OK 74152 | Oil Operator | Jun 1988 |
| 1128 | Davis, Michael G. | Wichita, KS 67212 | Oil & Gas Operator | Jul 1988 |
| 1129 | Davis, Robert E. | Graham, TX 76450 | Oil & Gas Operator | Apr 1997 |
| 1130 | Davis, Robert W. | Richfield, KS 67953 | Gas Operator | Dec 2010 |
| 1131 | Davis, Travis H., Gas Account | Borger, TX 79008 | Gas Operator | Feb 2015 |
| 1132 | Davis, William H. | Tulsa, OK 74103 | Oil & Gas Operator | Apr 2014 |
| 1133 | Dawson Resources Inc | Franktown, CO 80116 | Oil & Gas Operator | Mar 2015 |
| 1134 | Dawson-Markwell | | Oil & Gas Operator | Nov 1996 |
| 1135 | Dawson-Markwell Exploration Co. | Oklahoma City, OK 73101 | Oil & Gas Operator | Jun 2025 |
| 1136 | Daylight Petroleum LLC | Houston, TX 77052 | Oil & Gas Operator | Oct 2025 |
| 1137 | Daystar Petroleum, Inc. | Eureka, KS 67045 | Oil & Gas Operator | Jun 2025 |
| 1138 | DB Energy, LLC | Baldwin City, KS 66006 | Oil Operator | May 2025 |
| 1139 | DBD Oil, LLC | Emporia, KS 66801 | Oil Operator | Jun 2025 |
| 1140 | DCF Exploration | Lakewood, CO 80215 | Oil Operator | Dec 1989 |
| 1141 | DCP Midstream, LP | Denver, CO 80237 | Oil Operator | Nov 2006 |
| 1142 | De & TZ LLC | Wellsville, KS 66092 | Oil Operator | Jun 2025 |
| 1143 | Dearinger Compan | | Oil Operator | Dec 1994 |
| 1144 | Decab Company | Victoria, KS 67671 | Oil Operator | Aug 1996 |
| 1145 | Dechant Oil Operations, LLC | Hutchinson, KS 67501 | Oil Operator | Jun 2025 |
| 1146 | Deck Oil Company | Tulsa, OK 74101 | Oil & Gas Operator | Jun 2020 |
| 1147 | Decker Lease Ope | | Oil Operator | Dec 1988 |
| 1148 | Decker Petroleum | | Oil & Gas Operator | Oct 2002 |
| 1149 | Deer Run Oil Lease, LLC | Caney, KS 67333 | Oil Operator | Jun 2025 |
| 1150 | Delaware Dyche Corp. | Hutchinson, KS 67501 | Oil Operator | Jan 2010 |
| 1151 | Delhi Gas Pipeli | | Gas Operator | Aug 1998 |
| 1152 | Delhi Pipeline | | Oil & Gas Operator | Sep 1999 |
| 1153 | Dell-Ray Investments, Inc. | Nickerson, KS 67561 | Oil Operator | Dec 2019 |
| 1154 | Delozier, Orval & Stevens, Floyd, A General Partnership | Dewey, OK 74029 | Oil Operator | Nov 2009 |
| 1155 | Delta Petroleum Company | Houston, TX 77267 | Oil Operator | Aug 1996 |
| 1156 | Delta Petroleum Corp | Denver, CO 80202 | Oil & Gas Operator | Dec 2024 |
| 1157 | Deltex Petroleum | | Oil Operator | Nov 1994 |
| 1158 | Denchfield, Fred | Neal, KS 66863 | Oil Operator | Dec 1997 |
| 1159 | Denis Roberts Oil | | Oil Operator | May 2025 |
| 1160 | Denman J M Oil C | | Oil Operator | Mar 1994 |
| 1161 | Denmark Oil | Wichita, KS 67212 | Oil & Gas Operator | May 2000 |
| 1162 | Dennis Fitzpatrick Rev. Trust | Sterling, KS 67579 | Gas Operator | Jun 2025 |
| 1163 | Denny, Arthur Gene | Independence, KS 67301 | Oil Operator | Oct 1996 |
| 1164 | Denova | | Oil Operator | Jan 1989 |
| 1165 | Dernick Resources, Inc. | Dallas, TX 75204 | Oil & Gas Operator | Jan 2002 |
| 1166 | Derrick Petroleu | | Oil Operator | Sep 1994 |
| 1167 | Derrick Resources Inc. | Henryetta, OK 74437-4249 | Oil & Gas Operator | Jun 2025 |
| 1168 | Derrick-Amer Oil | | Oil Operator | Dec 1991 |
| 1169 | Deshal Energy LLC | Oklahoma City, OK 73170 | Oil Operator | Apr 2025 |
| 1170 | Destiny Petroleum LLC | The Woodlands, TX 77381 | Oil & Gas Operator | May 2024 |
| 1171 | Destiny Services LLC | Pratt, KS 67124 | Oil & Gas Operator | Jan 2024 |
| 1172 | Deutsch Oil Comp | | Oil & Gas Operator | Oct 1994 |
| 1173 | Deutsch Oil Company | | Oil & Gas Operator | Jun 2025 |
| 1174 | Deutscher Oil Operations | | Oil Operator | Jun 2025 |
| 1175 | Development Ener | | Oil Operator | Dec 1994 |
| 1176 | Devon Energy Corporation | Oklahoma City, OK 73102 | Oil & Gas Operator | Dec 2009 |
| 1177 | Devon Energy Production Company LP | Oklahoma City, OK 73102 | Oil & Gas Operator | Oct 2025 |
| 1178 | Devonian Oil Com | | Oil Operator | Dec 1996 |
| 1179 | Devonian Oil Company | Lawrence, KS 66044 | Oil Operator | May 2001 |
| 1180 | Dewayne'S Tank Service, Inc. | Saint John, KS 67576 | Oil Operator | Nov 2000 |
| 1181 | Dexxon, Inc. | Kiefer, OK 74041 | Oil & Gas Operator | Jun 2025 |
| 1182 | DGH Oil, LLC | Logan, KS 67646 | Oil Operator | Jun 2025 |
| 1183 | DHP Investments, LTD. | Tyler, TX 75703 | Oil Operator | Jun 2025 |
| 1184 | Diamond B Indust | | Oil Operator | Nov 1996 |
| 1185 | Diamond B Miami Flood, LTD. | Paola, KS 66071 | Oil Operator | Jun 2025 |
| 1186 | Diamond Chemical | | Oil & Gas Operator | Jan 1995 |
| 1187 | Diamond Dixie Ex | | Oil Operator | Jul 1985 |
| 1188 | Diamond Star Oil, Inc. | Lacygne, KS 66040 | Oil Operator | Dec 2019 |
| 1189 | Diehl Glenn D Oi | | Oil Operator | Jul 1993 |
| 1190 | Diehl Oil Inc | Hays, KS 67601 | Oil Operator | Jun 2025 |
| 1191 | Dieter Prod Comp | | Oil & Gas Operator | Feb 1991 |
| 1192 | Dieter Production Company | Durham, KS 67438 | Gas Operator | Mar 2013 |
| 1193 | Dietrich Oil Co., A General Partnership | Humboldt, KS 66748 | Oil Operator | Jul 2000 |
| 1194 | Dilley, W.R. & A'Meta I. | Sedan, KS 67361 | Oil Operator | Nov 2015 |
| 1195 | Dimick Production, LLC | Hamilton, KS 66853 | Oil Operator | Jun 2025 |
| 1196 | Directional Drilling Systems, LLC | Greenwood VIllage, CO 80111 | Oil Operator | Dec 2019 |
| 1197 | Discovery Natural Resources LLC | Denver, CO 80202 | Oil & Gas Operator | Oct 2025 |
| 1198 | Discovery Operat | | Gas Operator | Jul 1988 |
| 1199 | Diversified Operating Corp. | Golden, CO 80401 | Oil & Gas Operator | Oct 2012 |
| 1200 | Dixie Oil Incorp | | Oil Operator | Jul 1992 |